I've noticed some of it myself.
The education system is changing. Especially since I graduated HS 5 years ago. The leaps in technology have also changed the atmosphere of school. If what you say about indigo children is true, it would seem that the first indigo children have grown and their impact on the world is being recognized now. The proof is that this generation has already made a huge difference in advocating in human rights, ethics, and challenging the status quo. Things are changing at an exponential rate and it is making a lot of people uncomfortable.
Also by your definition it also wouldn't be a stretch to assume that a child with autism would fall under the category of being an indigo child. Especially since there is no explanation as to why there has been a spike in children diagnosed with autism in the last 20 or so years. It's very fitting and very intriguing if it's true. It's definitely something to think about.